If installed on the same machine, SSH Tectia Client and SSH Tectia Server should always be upgraded to be the same version, because there are dependencies between the common components.

Check if you have some Secure Shell software, for example earlier versions of SSH Tectia products or OpenSSH server or client, running on the machine where you are planning to install the new SSH Tectia versions.

Before installing SSH Tectia products on Unix platform, stop any OpenSSH servers running on port 22, or change their listener port. You do not need to uninstall the OpenSSH software.

The following table shows you which SSH Tectia versions you need to uninstall before you can upgrade to SSH Tectia Client and Server 5.3.